#ifndef __MY_SERVICE__
#define __MY_SERVICE__ 
#include"data.hpp"
#include"httplib.h"

extern cloud::DataManager *_data;

namespace cloud 
{
    class Service 
    {
    public:
        int _server_port;
        std::string _server_ip;
        std::string _download_prefix;
        httplib::Server _server;
    private:
        static void Upload(const httplib::Request &req, httplib::Response &rsp) 
        {
            auto ret = req.has_file("file");
            if(ret == false) 
            {
                rsp.status = 400; 
                return; 
            }
            const auto& file = req.get_file_value("file");
            std::string back_dir = Config::GetInstance()->GetBackDir();
            std::string realpath = back_dir + FileUtil(file.filename).FileName();
            FileUtil fu(realpath);
            fu.SetContent(file.content);
            BackupInfo info;
            info.NewBackupInfo(realpath);
            _data->Insert(info);
            return; 
        }
        static std::string TimetoStr(time_t t) 
        {
            std::string tmp = std::ctime(&t);
            return tmp;
        }

        static void ListShow(const httplib::Request &req, httplib::Response &rsp) 
        {
            std::vector<BackupInfo> arry;
            _data->GetAll(&arry);
            std::stringstream ss;
            ss << "<html><head><title>Download</title></head>";
            ss << "<body><h1>Download</h1><table>";
            for(auto &a : arry)
            {
                ss << "<tr>";
                std::string filename = FileUtil(a.real_path).FileName();
                ss << "<td><a href='" << a.url << "'>" << filename << "</a></td>";
                ss << "td align='right'>" << TimetoStr(a.mtime) << "</td>";
                ss << "td align='right'>" << a.fsize / 1024 << "k</td>";
                ss << "</tr>"; 
            }
            ss << "</table></body></html>";
            rsp.body = ss.str();
            rsp.set_header("Content_Type", "text/html");
            rsp.status = 200;
            return; 
        }

        static std::string GetETag(const BackupInfo &info) 
        {
            FileUtil fu(info.real_path);
            std::string etag = fu.FileName();
            etag += "-";
            etag += std::to_string(info.fsize);
            etag += "-";
            etag += std::to_string(info.mtime);
            return etag; 
        }

        static void Download(const httplib::Request &req, htthplib::Response &rsp) 
        {
            BackupInfo info;
            _data->GetOneByURL(req.path, &info);
            if(info.pack_flag == true) 
            {
                FileUtil fu(info.pack_path);
                fu.Uncompress(info.real_path);
                fu.Remove();
                info.pack_flag = false;
                _data->Update(info); 
            }

            bool retrans = false;
            std::string old_etag;
            if(req.has_header("If-Range"))
            {
                old_etag = req.get_header_value("If-Range");
                if(old_etag == GetETag(info)) 
                {
                    retrans = true; 
                }
            }

            FileUtil fu(info.real_path);
            if(retrans == false) 
            {
                fu.GetContent(&rsp.body);
                rsp.set_header("Accept-Ranges", "bytes");
                rsp.set_header("ETag", GetETag(info));
                rsp.set_header("Content-Type", "application/octet-stream"); 
                rsp.status = 200;
            }
            else 
            {
                fu.GetContent(&rsp.body);
                rsp.set_header("Accept-Ranges", "bytes");
                rsp.set_header("ETag", GetETag(info));
                rsp.set_header("Content-Type", "application/octet-stream");
                rsp.status = 206; 
            }
        }
    public:
        Service() 
        {
            Config *config = Config::GetInstance();
            _server_port = config->GetServerPort();
            _server_ip = config->GetServerIp();
            _download_prefix = config->GetDownloadPrefix(); 
        }

        bool RunModule() 
        {
            _server.Post("/upload", Upload);
            _server.Get("/listshow", ListShow);
            _server.Get("/", ListShow);
            std::string download_url = _download_prefix + "(.*)";
            _server.Get(download_url, Download);
            _server.listen(_server_ip.c_str(), _server_port); 
        }
    };
}

#endif 
